Noun
A stroke made with a downward motion of the pen or pencil.
Source: Webster's dictionaryFlight feathers are stiffened so as to work against the air in the downstroke but yield in other directions. Source: Internet
Wooten popularized the "double thump," in which the string is slapped twice, on the upstroke and a downstroke (for more information, see Classical Thump ). Source: Internet
The pigeon had particularly large breast muscles that indicate powerful flight ( musculus pectoralis major for downstroke and the smaller musculus supracoracoideus for upstroke). Source: Internet